Why does the Earth keep spinning?


The answer can be simple: because things in motion stay in motion. First law of motion from Newton. It is all about inertia: hen you set things in motion, if there are no forces acting upon an object, that object stays in motion.

Once an object is moving you do not need a force to keep that object moving. On Earth the friction with ground or air will stop the object from moving, but not in space. The same holds true for spinning objects. Get a spinner spinning and put it in a vacuum room and levitating using some magnets and you will see that spinner spinning for a long time.

Nick Lucid explains it more intelligently and with formulas too. What’s not to love when it comes to physics? Nothing.

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